I shared some of this in a C25K that some of us are participating in, but I thought I would ask the runners here in the larger group if anyone is dealing with asthma.
I think I've had asthma for years, probably since I was a teenager but I didn't know what it was and was never diagnosed. I didn't know that everyone didn't feel this way so I probably never mentioned it! But the feeling of being kicked in the chest, of air burning (that's not quite the right word) down my windpipe into my lungs--these are all familiar to me. Last winter when I was at my heaviest, it was truly awful. I started losing weight and tried several medications (including inhalers) but nothing really worked until I tried Singulair, which was like a miracle.
Fast forward to now. I'm 33 pounds lighter, learning to run, still taking my Singulair, and everything has been just fine. I've had a couple of 20 minute runs and had no problem with asthma. Well, today I took a 2 hour drive to the other side of the state, and when I was there I noticed feeling a little asthmatic, but by the time I got home I was fine. I went out for my run and BAM--no air. I was breathless almost immediately but instead of turning for home, I started spelling myself with walks/running. I got a mile from home and felt like I had been kicked in the chest. Luckily, my son's apartment was close by and he gave me a drink of water and drove me home.
Of course I have no inhalers here at the house. I took a pill and feel better but......am I going to have to start using inhalers? My plan is to call the doctor in the morning and see what she recommends. Do any of you have asthma, and if so, have you been able to successfully run?

Usually i have to take my inhaler at least once per run, normally at the begining before i get warm. My advice to you is to have a number of inhalers around. If you are running dont go without one in your pocket. I usually have 2 on the go at a time- one in the bag i am going out with and one in my gym bag. I am never, ever without one. I've never heard of singulair, but i use ventolin to manage the attacks and flixotide as a preventor. If you are prescribed a preventor make sure you take it as many times as you are supposed to (most asthmatics are terrible for taking their preventor, myself included
).
Im sure your doctor will know what is best for you to control it. Happy running!